I need help with a problem

hrdhtdvr

I was just listening to my stereo when the audio quit. Actually, it got REALLY faint. At first I thought that it was the sattilite radio but when I changed sources, it still did it. I checked regular radio and the same thing. It cuts out every now and then and comes right back within a couple of seconds. I looked at the volt meter on my truck, and that is still saying that I have about 14.5 volts. I checked the volume, and it was not any louder than what I normally play it at. I thought that maybe it was because of the weather because it was storming with lightning. Then my wife told me that it was doing it to her earlier in the day and the weather was clear. My sub sits directly in front of the amp, so nothing could get in there and bump the adjustments. Any ideas?

Thanks in advance.